linux-kernel - Re: [PATCH v3 3/3] gpio: add support for Cypress CYUSBS234 USB-GPIO adapter

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Date:	Tue, 7 Oct 2014 19:03:56 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Muthu Mani <muth@...ress.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rajaram Regupathy <rera@...ress.com>,
	Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v3 3/3] gpio: add support for Cypress CYUSBS234 USB-GPIO adapter

On Mon, Oct 6, 2014 at 11:47 PM, Muthu Mani <muth@...ress.com> wrote:
> +
> +static int cy_gpio_direction_input(struct gpio_chip *chip,
> +                                       unsigned offset)
> +{
> +       return 0;
> +}
> +
> +static int cy_gpio_direction_output(struct gpio_chip *chip,
> +                                       unsigned offset, int value)
> +{
> +       return 0;
> +}

If that chip is capable of both output and input, shouldn't these
functions be implemented? I think this has already been pointed out in
a previous version but you did not reply.

> +
> +static int cyusbs23x_gpio_probe(struct platform_device *pdev)
> +{
> +       struct cyusbs23x *cyusbs;
> +       struct cyusbs_gpio *cy_gpio;
> +       int ret = 0;
> +
> +       dev_dbg(&pdev->dev, "%s\n", __func__);

> +
> +       cyusbs = dev_get_drvdata(pdev->dev.parent);
> +
> +       cy_gpio = devm_kzalloc(&pdev->dev, sizeof(*cy_gpio), GFP_KERNEL);
> +       if (cy_gpio == NULL)
> +               return -ENOMEM;
> +
> +       cy_gpio->cyusbs = cyusbs;
> +       /* registering gpio */
> +       cy_gpio->gpio.label = dev_name(&pdev->dev);
> +       cy_gpio->gpio.dev = &pdev->dev;
> +       cy_gpio->gpio.owner = THIS_MODULE;
> +       cy_gpio->gpio.base = -1;
> +       cy_gpio->gpio.ngpio = 12; /* total GPIOs */

Isn't there a way to get the number of GPIOs from a reliable source?
If not, please at least use a macro here.
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